The deterministic call, explained like a 25-year tech.
An 11-refrigerant SH/SC engine and a diagnostic quadrant matrix decide the fault. An optional AI mentor explains it. Built for refrigeration and heat-pump work.
Deterministic first. Always.
11-refrigerant SH/SC engine
Pressure-temperature math for eleven refrigerants, computed with a Lee-Kesler model. Superheat and subcooling resolve live, with target/tolerance that switch automatically between TXV/EEV and fixed-orifice metering.
Diagnostic quadrant matrix
A superheat-vs-subcooling quadrant maps your readings to a specific fault label — undercharged, overcharged, restriction, overfeeding, or normal — not a vague list of maybes.
Heat-pump heating mode
A dedicated heating-mode path reasons about the reversing valve, defrost cycle, and iced coils, and stamps every report "HEAT PUMP — HEATING" so the call is never misread.
Live SH / SC — 11 refrigerants
A Lee-Kesler pressure-temperature engine covers eleven refrigerants. Target superheat and subcooling tolerances switch automatically between TXV/EEV and fixed-orifice systems, so the numbers you compare against are always the right ones for the metering device in front of you.
Diagnostic quadrant matrix
Plot superheat against subcooling and the matrix returns a specific fault label — undercharged, overcharged, liquid-line or metering restriction, overfeeding, or normal operation — with the reasoning behind the call.
Heat-pump heating diagnostics
Heating mode is a different machine. SCSH reasons about reversing-valve position, defrost timing, and iced outdoor coils, and clearly stamps the session as HEAT PUMP — HEATING so nobody reads a heating call against cooling targets.
AI mentor report
On demand, an AI mentor — tuned to explain the call like a 25-year tech — writes up the diagnosis in plain language, drawing on an OEM document cache and live web search for model-specific guidance. The deterministic verdict is always computed first; the mentor explains it, it doesn't replace it.
Model-number autocomplete
Start typing a model number and SCSH autocompletes it, then auto-fills the refrigerant and system details so you're not hunting the data plate twice.
Thumb rules & symptom matrix
A built-in cheat sheet of field thumb-rules and a symptom matrix, each backed by mini-calculators so you can sanity-check a reading without leaving the screen.
Components & procedures library
A reference library of components and step-by-step procedures, including five heat-pump procedures, so the right sequence is in your hand on the call.
Findings capture
Log each finding as CONFIRM, RULE OUT, REPAIRED, or REPLACED. Entries are immutable once recorded — an honest, tamper-evident record of what you actually did on the call.
From reading to paperwork, in one place.
Job history & per-session PDF
Every session is saved to job history and exports as its own PDF — the full record of one call, ready to attach or print.
Voice notes
Capture observations hands-free while you work, attached to the session.
Shop-logo-branded PDFs
Reports carry your shop's logo, so the paper that defends the invoice looks like it came from you.
FSM hand-off
"Copy as Job Note" drops a clean summary straight into ServiceTitan, Housecall Pro, or Jobber — plus structured JSON for anything else.
Per-tech accounts & shop teams
Each tech gets their own account. Owners spin up a shop, invite techs with a code, and manage seats.
AI mentor on demand
Generate a mentor write-up only when you want one — the deterministic diagnosis stands on its own.
Built for the truck and the office.
Solo tech or whole shop.
Start solo for $19 a month. Run a crew on Shop Base for $49 a month, plus $8 for each additional seat. SCSH is in beta — pricing is live for early shops.
Solo
- Full deterministic engine
- All 11 refrigerants
- AI mentor reports
- Shop-branded PDF reports
- Offline PWA
Shop Base
- Everything in Solo
- Shop team with invite codes
- Per-tech accounts & seats
- Shared job history
- Add seats at $8/mo each
Frequently asked questions
Diagnose it. Don't guess it.
The deterministic engine makes the call. The AI mentor explains it. You leave the job right — with the paperwork already done.